Audio_Alarm_RAK18003.ino

/**
   @file Audio_Alarm_RAK18003.ino
   @author rakwireless.com
   @brief The microphone detects the noise threshold and when the ambient noise is greater than the set threshold,
   a warning will be generated. And the LED of WisBase will lights.
   @note This example need use the RAK18003 module.
   @version 0.1
   @date 2022-06-10

   @copyright Copyright (c) 2022
*/
#include "audio.h" // Click here to install the library: http://librarymanager/All#RAKwireless-Audio
#include <Arduino.h>

TPT29555   Expander1(0x23);
TPT29555   Expander2(0x25);

Channel_Mode channels = left; // stereo or left or right
int frequency = 16000;
// buffer to read samples into, each sample is 16-bits
short sampleBuffer[BUFFER_SIZE];
volatile uint8_t read_flag = 0;
//Alarm threshold
int audio_threshold = 1000; //The threshold value of the noise trigger can be modified according to the environmental conditions
int g_alarm = 0;

int abs_int(short data);
void onPDMdata();
void RAK18003Init(void);

void setup()
{
  pinMode(WB_IO2, OUTPUT);
  digitalWrite(WB_IO2, HIGH);
  delay(500);
  pinMode(LED_GREEN, OUTPUT);
  pinMode(LED_BLUE, OUTPUT);
  digitalWrite(LED_BLUE, LOW);
  digitalWrite(LED_GREEN, LOW);

  // Initialize Serial for debug output
  time_t timeout = millis();
  Serial.begin(115200);
  while (!Serial)
  {
    if ((millis() - timeout) < 3000)
    {
      delay(100);
    }
    else
    {
      break;
    }
  }

  RAK18003Init();
  // configure the data receive callback
  PDM.onReceive(onPDMdata);
  // initialize PDM with:
  // - one channel (mono mode)
  // - a 16 kHz sample rate
  if (!PDM.begin(channels, frequency)) {
    Serial.println("Failed to start PDM!");
    while (1) yield();
  }
  delay(500);
  Serial.println("=====================================");
}
void loop()
{
  // wait for samples to be read
  if (read_flag == 1) {
    read_flag = 0;
    uint32_t sum = 0;
    // print samples to the serial monitor or plotter
    for (int i = 0; i < BUFFER_SIZE; i++) {
      sum = sum + abs(sampleBuffer[i]);
    }
    int aver = sum / BUFFER_SIZE;
    if (aver > audio_threshold)
    {
      /*You can add your alarm processing tasks here*/
      g_alarm++;
      Serial.printf("Alarm %d\r\n", g_alarm);
      digitalWrite(LED_BLUE, HIGH);
      digitalWrite(LED_GREEN, HIGH);
      delay(2000);
      digitalWrite(LED_BLUE, LOW);
      digitalWrite(LED_GREEN, LOW);
    }
  }

}
int abs_int(short data)
{
  if (data > 0) return data;
  else return (0 - data);
}
void onPDMdata() {
  // query the number of bytes available
  // read into the sample buffer
  PDM.read((uint8_t *)sampleBuffer, BUFFER_SIZE * 2);
  read_flag = 1;
}
void RAK18003Init(void)
{
  while (!Expander1.begin())
  {
    Serial.println("Did not find RAK18003 IO Expander Chip1,please check !");
    delay(500);
  }

  while (!Expander2.begin())
  {
    Serial.println("Did not find RAK18003 IO Expander Chip2,please check !");
    delay(500);
  }
  Expander1.pinMode(0, INPUT);    //SD check
  Expander1.pinMode(1, INPUT);    //MIC check
  Expander1.pinMode(2, INPUT);    //MIC CTR1
  Expander1.pinMode(3, INPUT);    //MIC CTR2
  Expander1.pinMode(4, INPUT);    //AMP check
  Expander1.pinMode(5, INPUT);    //AMP CTR1
  Expander1.pinMode(6, INPUT);    //AMP CTR2
  Expander1.pinMode(7, INPUT);    //AMP CTR3
  Expander1.pinMode(8, INPUT);    //DSP check
  Expander1.pinMode(9, INPUT);    //DSP CTR1  DSP int
  Expander1.pinMode(10, INPUT);   //DSP CTR2  DSP ready
  Expander1.pinMode(11, OUTPUT);  //DSP CTR3  DSP reset
  Expander1.pinMode(12, INPUT);   //DSP CTR4  not use
  Expander1.pinMode(13, INPUT);   //DSP CTR5  not use
  Expander1.pinMode(14, INPUT);   //NOT USE
  Expander1.pinMode(15, INPUT);   //NOT USE

  //  Expander1.digitalWrite(14, 0);    //set chip 1 not use pin output low
  //  Expander1.digitalWrite(15, 0);    //set chip 1 not use pin output low

  Expander2.pinMode(0, OUTPUT);  //CORE  SPI CS1 for DSPG CS
  Expander2.pinMode(1, OUTPUT);  //CORE  SPI CS2
  Expander2.pinMode(2, OUTPUT);  //CORE  SPI CS3
  Expander2.pinMode(3, OUTPUT);  //PDM switch CTR    1 to dsp   0 to core
  Expander2.pinMode(4, INPUT);  //not use
  Expander2.pinMode(5, INPUT);  //not use
  Expander2.pinMode(6, INPUT);  //not use
  Expander2.pinMode(7, INPUT);  //not use
  Expander2.pinMode(8, INPUT);  //not use
  Expander2.pinMode(9, INPUT);  //not use
  Expander2.pinMode(10, INPUT); //not use
  Expander2.pinMode(11, INPUT); //not use
  Expander2.pinMode(12, INPUT); //not use
  Expander2.pinMode(13, INPUT); //not use
  Expander2.pinMode(14, INPUT); //not use
  Expander2.pinMode(15, INPUT); //not use

  Expander2.digitalWrite(0, 1);  //set SPI CS1 High
  Expander2.digitalWrite(1, 1);  //set SPI CS2 High
  Expander2.digitalWrite(2, 1);  //set SPI CS3 High

  Expander2.digitalWrite(3, 0);   //set the PDM data direction from MIC to WisCore

  // if(Expander1.digitalRead(0) == 1)  //Check SD card
  // {
  //   Serial.println("There is no SD card on the RAK18003 board, please check !");
  // }

  while (Expander1.digitalRead(1) == 0) //Check if the microphone board is connected on the RAK18003
  {
    Serial.println("There is no microphone board, please check !");
    delay(500);
  }

  // if(Expander1.digitalRead(4) == 0)  //Check if the RAK18060 AMP board is connected on the RAK18003
  // {
  //   Serial.println("There is no RAK18060 AMP board, please check !");
  // }

  // if(Expander1.digitalRead(8) == 0)  //Check if the RAK18080 DSPG board is connected on the RAK18003
  // {
  //   Serial.println("There is no RAK18080 DSPG board, please check !");
  // }

}